CADMIUM-SULFIDE NANOPARTICLES IN LANGMUIR-BLODGETT-FILMS OF CALIXARENES

CdS nanoparticles have been formed within Langmuir-Blodgett (LB) films of cadmium salts of calix[8]- and calix[4]arene by reaction with hydr ogen sulfide gas. The presence of CdS nanoparticles in the LB film mat rices was checked by measurement of UV-vis absorption spectra, which a llows an estimation of the size of the particles. It was shown that sm aller particles (1.5 +/- 0.3 nm) are formed in calixarene LB films tha n in Cd stearate films (used for comparison). The particle size does n ot depend on the type of calixarene or the number of LB layers but inc reases with increasing pH of the subphase. The formation of CdS was di rectly confirmed with XPS.